CN102278218A - Method and device for detecting the cetane number - Google Patents
Method and device for detecting the cetane number Download PDFInfo
- Publication number
- CN102278218A CN102278218A CN2011101583653A CN201110158365A CN102278218A CN 102278218 A CN102278218 A CN 102278218A CN 2011101583653 A CN2011101583653 A CN 2011101583653A CN 201110158365 A CN201110158365 A CN 201110158365A CN 102278218 A CN102278218 A CN 102278218A
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- Prior art keywords
- cetane number
- speed
- diesel engine
- fuel
- engine
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
- F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a method and a device for detecting the cetane number. The method for detecting the cetane number of the fuel used by a direct-injection diesel engine equipped with a turbocharger comprises the steps of operating the diesel engine with at least two different delays of the start of injection with respect to a nominal start of injection, measuring the turbocharger speed depending on the delay, and determining the cetane number from the variation of the turbocharger speed with the delay. The invention also concerns a device for detecting the cetane number of the fuel used by a direct-injection diesel engine equipped with a turbocharger.
Description
Technical field
The present invention relates to detect the method and apparatus of the cetane number of the fuel that direct injection diesel engine uses, described diesel engine is equipped with turbosupercharger.
Background technique
Cetane number is to weigh a standard of diesel fuel burning quality, particularly ignition lag, and described ignition lag is the time period between start-of-injection and fuel combustion starting.Therefore, in engine control system, need to consider cetane number, so that determine optimum fuel injection timing and emitted dose and best exhaust gas recirculatioon parameter.Fail to reach and to cause the noise and the exhaust emission that raise like this.
Yet, a lot of zones in the world, the cetane number of diesel fuel (CN) changes with the concrete state of supplier, delivery quality or fuel supply.For example in the North America, cetane number changes between 40-55 in different states.Therefore, the mutability of cetane number is very uncertain factor for engine control system.Therefore, after deliberation measure the method for cetane number.
Known method comprises that the detonation sensor that use is installed on the motor detects the burning signal.Yet this sensor has increased whole cost, and it always can not find the suitable position of sensor.Alternative relies on the variation of when start-of-injection changes motor instantaneous acceleration or moment of torsion.The unessential extra sensor of a kind of method in back, but reliability deficiency.
According to EP 2 032 232A1, cetane number is by using angular-rate sensor, and the variation amplitude of measuring engine crankshaft angular velocity is detected.This amplitude is relevant with cetane number.Therefore, according to the cetane number of determining, multiple parameter for example fuel injection timing and emitted dose is calculated.Extra sensor signal can be used for controlling the correction of carrying out, for example delivery temperature, oxygen concentration and turbosupercharger rotational speed.Owing to need to detect the variation of angular velocity of crankshaft per minute during rotation, then need high performance angular-rate sensor, therefore increased the cost of total system.
Summary of the invention
The purpose of this invention is to provide the method and apparatus of the cetane number of the fuel that detects the diesel engine use, diesel engine is equipped with turbosupercharger, avoids the shortcoming of previously mentioned solution simultaneously.
The objective of the invention is by the method according to this invention and realize according to device of the present invention.
According to the present invention, have been noted that the rotational speed of the turbosupercharger of turbo-charging diesel motor can be as the indication of the cetane number of diesel engine burnt fuel.More specifically, have been found that turbocharger speed is different to the dependence of fuel injection timing for the fuel of different cetane number.
In the method for property of the present invention, the cetane number of the employed fuel of direct injection diesel engine determines that by using with respect to two that the demarcate fuel injection start different fuel injection start operation diesel engine that postpone described diesel engine is equipped with turbosupercharger.Therefore, for example, the demarcation timing that motor sprays at fuel is with first mode operation, and then in the timing that postpones with second mode operation, described start-of-injection is postponed with respect to the start-of-injection of demarcating.Particularly, main injection is postponed by transformable delay, but pilot injection and other injections are also postponed.
According to the present invention, turbocharger speed is measured in described at least two different delays place.Therefore provide and relied on the turbocharger speed that start-of-injection postpones.The turbocharger speed of being measured by turbocharger speed sensor is the rotational speed of turbocharger turbine or the speed that at least directly relies on turbo machine.Now, turbosupercharger becomes velocity transducer is housed more and more, is used for overspeed protection, air path control, and the estimation of back pressure or mass flow rate and/or other purposes for example are used for measuring the leakage rate in concrete turbosupercharger configuration.In this case, the turbocharger speed sensor signal is available in the engine control electronic device, and this provides about relying on the turbocharger speed information that start-of-injection postpones.
The variation that turbocharger speed postpones with start-of-injection relies on cetane number and therefore allows determining of cetane number.Thisly determine that the predetermined value of a series of cetane number of can be for example storing in turbocharger speed by the turbocharger speed that compares and measures or measurement and deviation between the calibration value and the look-up table realizes, realize by the calculating of implementing based on the prestor algorithm that perhaps described prestor algorithm makes cetane number and turbocharger speed or measured speed variation relevant.
Therefore, cetane number can based on the signal of turbocharger speed sensor with simple, cost efficient and reliably mode be determined, this is available in most of engine control system.
According to a preferred embodiment of the invention, when described at least two differences of application postponed, diesel engine operated in the medium engine speed scope.Preferred engine speed range can be for example from 1000rpm to 3000rpm (commentaries on classics per minute), and more preferably from 1500rpm to 2000rpm.According to this aspect of the invention, have been found that the obvious dependence of turbocharger speed and cetane number occurs in the medium engine speed place, thereby allow determining of the most reliable cetane number.
According to another preferred embodiment of the invention, rely on described two different retard times engine speed and/or engine loading at least.In this way, can be according to such fact, promptly according to the speed of motor, the dependence of turbocharger speed can be the most tangible under different start-of-injection postpone.Therefore, for example at given engine speed place, can enough provide the positive effect of cetane number with respect to the short delay of demarcating timing, and at different engine speed places, it is necessary that long delay relies on manifesting of effect for tangible cetane number to turbocharger speed.The delay of most preferred detection cetane number can be in service definite in demarcation.Also depend on other engine parameters selected retard time, for example be in particular engine loading.By selecting to consider engine speed and/or load in retard time, can realize determining of the most reliable cetane number.
In advantageous embodiments, when using at least two different delays, diesel engine operates in substantially invariable engine speed and/or load place.In order to realize constant engine speed and/or load, the normal operation of motor can be interrupted one short period.Time period can enough lack, so that the driver of the vehicle of equipment motor does not recognize interruption.In this way, can implement determining of simple and reliable cetane number.
According to other preferred embodiments, the method that detects cetane number is implemented during dynamic operation condition.Particularly, if possible, for example the time period of constant engine speed and/or load can be selected at the normal operation period of motor for constant duty.Alternately, the change of using at least two different start-of-injection timing period engine parameters can be allow and can be according to prestor collection of illustrative plates by engine parameter, turbocharger speed and cetane number.In this way, cetane number can be determined at any time, and does not interrupt the normal operation of motor.
The method that detects cetane number can be by the driver of the vehicle that is equipped with diesel engine or the operator of motor (operator) manual starting.Advantageously, the method for property of the present invention can automatically regularly implemented during the dynamic operation of motor or when condition is fit to the method for enforcement detection cetane number.In this way, the cetane number of fuel can be determined termly, thereby actual cetane number all is available at any time.
According to other preferred embodiments, described method is automatically performed after fuel make up, as indicated by for example supply sensor.In this way, when taking place, the variation of cetane number can determine cetane number.Described method is starting immediately or (for example, after consuming some fuel) starting after some times after fuel make up, so the mixing and use refilling fuel filling fuel system of its explanation and residual fuel.
Be used to detect the invention device of the cetane number of the fuel that direct injection diesel engine uses, described diesel engine is equipped with turbosupercharger, and described device comprises turbocharger speed sensor and is programmed the electronic engine control unit that is used to carry out property method of the present invention.Modern direct fuel-injection engine comprises electronic motor management system, and described system needs the present engine parameter and changes the data of fuel injection timing and emitted dose.Therefore, property method of the present invention can be implemented by electronic control unit, and does not need other sensors and actuator.Particularly, the testing result of cetane number can be displayed to driver or operator by display unit, and/or can automatically be used the management with the optimization motor that is used for adjusting according to the cetane number of the fuel of current use.
The method of operation diesel engine comprise the fuel that detect to use cetane number the invention method and comprise according to determined cetane number and adjust in pilot injection timing, pilot injection amount, main injection timing and/or the exhaust gas recirculation rate at least one.In this way, no matter the current cetane number of using fuel all can realize the optimal engine management that improves performance and reduce noise and other effulents.The invention method that detects cetane number can make up with additive method, so that increase reliability and accuracy.
Description of drawings
Other aspects of the present invention will become obvious in the accompanying drawings with in the description of following specific implementation method.
Fig. 1 has shown the figure hoist pennants according to the delay measurements turbocharger speed of start-of-injection, the delay of described start-of-injection is that described diesel engine comprises direct fuel injection system, turbosupercharger and exhaust gas recycling system with respect to the delay of the demarcation start-of-injection of example diesel engine under various engine speeds.
Embodiment
As in Fig. 1, showing, in the medium range of engine speed,, in turbocharger speed, there is tangible, measurable difference according to the fuel of employed high or low cetane number.The circle indication cetane number (CN) of filling is the measured value of 53 diesel fuel, and the square of filling indication CN value is the measured value of 42 diesel fuel.Four pairs of curves that are presented among Fig. 1 are all represented given engine speed, and it has indicated the speed that is postponed measured turbosupercharger by turbocharger speed sensor for a series of start-of-injection.
In Fig. 1, curve 1 and 1 ' represents that all engine speed is 1000rpm (a commentaries on classics per minute), and curve 4 and 4 ' represents that all engine speed is 3000rpm.As appreciable in Fig. 1, do not exist turbocharger speed to rely on the significant change of CN value at those engine speed places.
It is 1500rpm that curve 2 and 2 ' all refers to engine speed, and curve 3 and 3 ' represents that all engine speed is 2000rpm.Under each situation, turbocharger speed significantly relies on the cetane number of employed fuel, and (CN53) is indicated significantly to depart from the curve 2 of CN 53 fuel and curve 3 ' (CN 42) deflection curve 3 as the curve 2 ' by CN 42 fuel.As indicating by arrow 5 and arrow 6, engine speed takes place to depend on the most significant retard time of departing from turbocharger speed.
In shown example, cetane number is determined by locating to move diesel engine in constant engine speed (as measured by engine speed sensor) and measuring turbocharger speed by turbocharger speed sensor.Motor is by demarcating the injection timing operation in first operating mode, i.e. the start-of-injection of fuel delay is 0.Therefore, first value or the calibration value of turbocharger speed have been measured.In second operating mode, the start-of-injection relative Calibration timing of fuel is postponed, and particularly the main fuel start-of-injection is postponed.Times selected postpones section according to default to the demarcation quilt of single motor or the enforcement of the type motor, and engine speed is depended in described delay.The predefined value that postpones is selected so that the remarkable difference of the turbocharger speed that uses different cetane number to be provided.Therefore, measured second value of turbocharger speed.The cetane number of the fuel that the different indication diesel engine of first value and second value are used.In given example, for cetane number is that 53 fuel difference is 0, and be 42 fuel for cetane number, described difference corresponds to the about 10% of the first turbocharger speed value at the engine speed place of 1500rpm, and corresponds to about 15% at the engine speed place of 2000rpm.This variation can be detected reliably, thereby allows enough to determine exactly cetane number.Motor can be running in other operating modes of using other delays, so that measure other turbocharger speed values, improves the accuracy that cetane number detects thus.
The delay of the fuel injection start in second operating mode does not need by default.Alternatively, when the deviation that the turbocharger speed and first value take place enough was used to detect the cetane number of fuel, described delay can be changed.In described example, at the 2000rpm place, only need set up a delay except 0, so that detect cetane number 42, and, need two length of delays of use except 0 to detect the fuel of CN 42 at the 1500rpm place.Therefore, cetane number can be determined with flexible way.
Claims (8)
1. method that detects the cetane number of the fuel that direct injection diesel engine uses, described direct injection diesel engine is equipped with turbosupercharger, said method comprising the steps of: use with respect to two that the demarcate start-of-injection different start-of-injection that postpone and move described diesel engine, according to the speed of the described turbosupercharger of described delay measurements, and determine cetane number with the variation of described delay by the speed of described turbosupercharger.
2. method according to claim 1 is characterized in that described diesel engine operates in the medium engine speed scope, preferably changes per minute to 3000 1000 and changes in the scope of per minute, more preferably changes per minute to 2000 1500 and changes in the scope of per minute.
3. method according to claim 1 and 2 is characterized in that described at least two speed and/or loads of depending on motor different retard time.
4. according to the described method of above arbitrary claim, it is characterized in that described diesel engine moves under substantially invariable engine speed and/or load.
5. according to the described method of above arbitrary claim, it is characterized in that described method is performed under dynamic operation condition.
6. according to the described method of above arbitrary claim, it is characterized in that described method is regularly carried out automatically.
7. according to the described method of above arbitrary claim, it is characterized in that described method is automatically performed after fuel make up.
8. device that is used for detecting the cetane number of the fuel that direct injection diesel engine uses, described direct injection diesel engine is equipped with turbosupercharger, described device comprises turbocharger speed sensor and control unit of engine, and described control unit of engine is programmed and is used for carrying out the above described method of arbitrary claim.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP10165088.5A EP2392801B1 (en) | 2010-06-07 | 2010-06-07 | Method and Device for Detecting the Cetane Number |
| EP10165088.5 | 2010-06-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102278218A true CN102278218A (en) | 2011-12-14 |
| CN102278218B CN102278218B (en) | 2015-12-16 |
Family
ID=43034338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110158365.3A Expired - Fee Related CN102278218B (en) | 2010-06-07 | 2011-06-07 | Detect the method and apparatus of cetane number |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2392801B1 (en) |
| CN (1) | CN102278218B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483464A (en) * | 2014-11-19 | 2015-04-01 | 上海沪顺石化装备有限公司 | Device and method for determining cetane number of diesel and biodiesel |
| CN107781052A (en) * | 2016-08-26 | 2018-03-09 | 马自达汽车株式会社 | The fuel property judgmental device and combustion control device of engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112011102608B4 (en) * | 2011-03-30 | 2016-09-29 | Toyota Jidosha Kabushiki Kaisha | The cetane number estimation device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534180A (en) * | 2003-04-02 | 2004-10-06 | 日产自动车株式会社 | Combustion control for IC engine |
| EP1900926A1 (en) * | 2006-09-11 | 2008-03-19 | HONDA MOTOR CO., Ltd. | Control system for internal combustion engine |
| WO2009063298A1 (en) * | 2007-11-14 | 2009-05-22 | Toyota Jidosha Kabushiki Kaisha | Controller for diesel engine and method of controlling diesel engine |
| CN101490398A (en) * | 2006-06-02 | 2009-07-22 | 洋马株式会社 | Cetane number detection means and engine having the cetane number detection means |
| WO2009112907A1 (en) * | 2008-03-13 | 2009-09-17 | Toyota Jidosha Kabushiki Kaisha | Cetane number estimation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2032232A4 (en) | 2006-04-15 | 2010-03-24 | Acs Ind Inc | Wound wire filter elements |
-
2010
- 2010-06-07 EP EP10165088.5A patent/EP2392801B1/en not_active Not-in-force
-
2011
- 2011-06-07 CN CN201110158365.3A patent/CN102278218B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534180A (en) * | 2003-04-02 | 2004-10-06 | 日产自动车株式会社 | Combustion control for IC engine |
| CN101490398A (en) * | 2006-06-02 | 2009-07-22 | 洋马株式会社 | Cetane number detection means and engine having the cetane number detection means |
| EP1900926A1 (en) * | 2006-09-11 | 2008-03-19 | HONDA MOTOR CO., Ltd. | Control system for internal combustion engine |
| WO2009063298A1 (en) * | 2007-11-14 | 2009-05-22 | Toyota Jidosha Kabushiki Kaisha | Controller for diesel engine and method of controlling diesel engine |
| WO2009112907A1 (en) * | 2008-03-13 | 2009-09-17 | Toyota Jidosha Kabushiki Kaisha | Cetane number estimation method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483464A (en) * | 2014-11-19 | 2015-04-01 | 上海沪顺石化装备有限公司 | Device and method for determining cetane number of diesel and biodiesel |
| CN104483464B (en) * | 2014-11-19 | 2016-08-31 | 上海沪顺石化装备有限公司 | For measuring diesel oil and the device and method of biodiesel Cetane number |
| CN107781052A (en) * | 2016-08-26 | 2018-03-09 | 马自达汽车株式会社 | The fuel property judgmental device and combustion control device of engine |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2392801A1 (en) | 2011-12-07 |
| EP2392801B1 (en) | 2016-01-06 |
| CN102278218B (en) | 2015-12-16 |
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Granted publication date: 20151216 |